package part1.language_basis.day07;

import java.util.Random;

/** 生成?位验证码
 * 包含大写字母、小写字母、数字 */
public class VerificationCode {

    public static void main(String[] args) {
        String code = generateVeriCode(6);
        System.out.println(code);
        char a = 'a';
        String b = a + "n";
        System.out.println(b);
        String c = a+'b'+"n";
        System.out.println(c);

    }

    /** 生成验证码 */
    public static String generateVeriCode(int len){
        String code = "";
        char[] chs = {'a','b','c','d','e','f','g','h','i','j','k','l','m',
                'n','o','p','q','r','s','t','u','v','w','x','y','z','A','B'
                ,'C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q'
                ,'R','S','T','U','V','W','X','Y','Z','0','1','2','3','4','5'
                ,'6','7','8','9'};
        Random random = new Random();
        for (int i = 0; i < len; i++) {
            int index = random.nextInt(chs.length);
            code += chs[index];
        }
        return code;
    }

}
